Carburetor



w.` J. EN EARL CARBURETOR Filed Feb. 2o. 192s gw N EVT, ll l r il 4,/I INVENToR.

ATTORNEY.`

Nov. l, 1927.

/z QI YPatented Nov. l 1927.

, Ummm 'sufre "Winter 1-'ey oem? oF Alle eo, mommy;

I .oARnUBETR 'Application mod Femum zo, logoserig; No, meer nom geuploly took, and. in yyloh tho 'Pro- 1o .irrespeetye .of @mount Y produ-ood.; @ed

in which these proportolS Celi be varied hy manually operable parte of the carburetor. vlolh aooomponyile droyviogle lis a ncentral vertical 4Section of my improved 115 carburetor; vFgl-2 is a section Aon the line 2-f2 ..011 s; lzirger'scal'e. Eig. 3 is prepro- Avluczon of afprt of Fig. El one larger Seele.

`f Smilar :reference Vcharacters` 'refer .to Vlike ports throughout the several views.

Thslearburetor comprises en air inlet` pesf sage l, mllo-t chamber 2,' Azt'mxilg chamber v43, connection 4 to receive the supply golpe 5v which extendsl to the fuel tank, a float fllarfng 'a `stern 7. guided at both .ends andV forlnecl with "a ValveS at tsfuppr. en lfand be turnecllfrom theposton shown n solid J lines n` Fig. lto that shown at l1 in dotted ylIeSloyeL crank l2 Sor any otherfsuitable line'ans'. These parts arey not generallynoyel.: The float 6 prevents the .fel from rlslng.k

higher' 'than the line A. Aenge 13 "may be f' ''s`l to'seoure th-e: c arlouretorto .the inlet-psge theengine. f ponan or 1..i' nto the zur 1n I The nozzlet'uloe 28l extenclsllloyynlntothe Hoot Cherokee. .So 21S to .ooootit t "guido 'for y lill Tle'pisfo'n '18 ,is proviood. wie lorir The @if in the spree l'371 moon the float* ehrnber projects take the'portons 15 ancl-l7 ofthe` Wall ofthe yfloat chamber support-lng f 011,18" ein-d' im upwardljf extending sleeve 19. joIfefezibly integral therewith.l The gir.

ne 1 fric-,odg noyer-,immolaclose joint generally sqare in cross-section eXept-at .111g 34. londe" loollo .my pb! Yolly @mooolto .Bioy-ol thievlliotoeb or Passages 2go between the protoni and: air volvo' @foto as linycoffitrols'the frflfA i1-'Cushion to prevent' sudden gf so Y.

isconoplld by .aber ,l1 thickened in' position loy 911140. When the 'air 'ylye olfteflllotls to l ri'o "Seddon-.ly o@ ll'nfllo .Sudoln floerl ng of the throttle; 'e current l of air 'will lift' ,this hall-21nd pnshit gganst'tli @gat .42 alooyo t'llmo Closing tholosoogo emilio- Thls con s truetron therefore' Constr-n.

trenino th .upward movement of the t S o oooh Rol forth@ oir yolye to restrain mm1/ick Should folio.' oiotor .loomv his il1jr-1.12K?

tune.; he Swings... flown Etheloyor 3 5 "-.yylioh raises the @metering pio food.: rooloooe tho' tore' enriched by mowing vthis* in. :the opposite dlrectlojn.`

Theparts be'ng 1n the position Shown; a

foclutoll of 'pressure oceur Within" theVV E'chamnloer 3,'ancl this .rednct'onof pressure eztencl down the passage between the sleeve el ftahk; l resulting' ln" a flowof' fuel therespace 44. The air pass-es up within the sleeve 26 and. through the reduced areal around the lip 8O so that a greater reduction of pressure occurs just above the lip than at the point 45. The fuel will therefore `flow upward from the float chamber and out the upper end of the nozzle tube :28, in spite of the reduced pressure in the oat chamber. i v I The suction effect at the upper end of the nozzle' tube 28 is as much greater than at the passage 44 as the area of .the passage between the members 18 and 45 is greater than the area ofthe yspace between the lip .30 of the'nozzle tube and the innercylindrical surface'of the sleeve 26, the velocity heads at these two points causing these differences in suction effect. Y'

Air beingmucli more mobile than the liquidfuel, the dash pot construction serves v to retard the sudden increase and decrease of air until the fuel can respond to the variations in air pressures in the mixing chamber; kThis therefore ensures a richer mixture-at the beginning of acceleration than would be possible if the air valve were not retarded. The rush of air through the primary passages 36, due to the opening of the valve 9 and the retarded movement of the air valve will result in a greater ydifference in pressures at and 45 and therefore in a greater flow of fuel from the nozzle tube. A Vslow opening of the throttle will not .cause Ythe ball 4l to seat at 42, so that air will freely flow up the passage 89 to the space 37, permitting the valve 2O to rise.

The air valve will therefore respond to slow openings of the throttle valve but will not move suddenly to respond to quick openings "effective lifting area of the air valve.

thereof The area ofthe chamber 37 is the The air valve by its weight serves to preserve: a predeterminedl ratio between thev f pressurewithin the fuel'V chamber above the [fuel nozzle so that the fuel will flow up the- `fuel nozzle no matter how great the suction fuel therein and at' the dischargeendof theV on the supply pipe 5 tank.

rIhe details of construction and the proportions of the parts may all be changed by those skilled in this art without departing from the spirit of'my invention as set forth in the following claims.

extending to the fuel l. In a carburetorthe combination of a float chamber, a lstationary head formed with primary air-passages and avertical passage connecting the discharge of the primary air-passages to the interior of the float chamber, a verticallymovable air valve and a nozzle tube carried thereby and extending into the `float chamberthrough the vertical' passage in the head, the area of the opening around the discharge end of the nozzle leffective areaof the primary yair passage at end of the nozzle tubeA and constituting a? continuation of ythe primary airpassage,

the eifectivearea of the-primary air passage at the upper'end of the nozzle tube being less thanthe 'area of the dischargeV of the air passages, andan anterior throttleto .control the flow of air'i'n'to' said carburetor.'

' 3. In a carburetor,the combination'of a float chamber, a nozzle tube extending upward from the lowerportion of'the-ioat chamber, an air valve and a support therefor formed with primary vair passages, a passage extending from discharge ofthe said primary air passages to the float chamber, said air valve surrounding the upper end of the nozzle tube and constituting a continuation of the. primary air passage, the

the upper end of the nozzle tube being less than the area of discharge of the airpassages and means to control th'e'flow of air through said carburetor, a metering pin within the nozzle tube -to control the flow 100 of fuel therefrom, and means f to move the metering pin to yregulatesaid flow, andan anterior throttle 'to control the `iiowof air" into said carburetor; y

4. In avcarburetor, the combination of a body having inlet and outlet passages, means to control the pressure in said inlet passage, an air valve mounted within the 1 carburetor and `adapted to bemoved-,by the suctionto permit secondary airV to passfrom the inlet to the youtlet passages and to 'cause the pressure within the `outlet to be a predetermined amount less than the pressure within the in let passage, said ycarburetor alsohaving a primary air passage connecting the inlet and outlet passages, the effective area of the discharge end of said primary air passage being reduced, a nozzle in said primary air pas sage, a closedv float chamber, a'nfuel tube extending therefrom and connecting. to said ynozzle and means for regulating the flow lof fuel therefrom, said carburetor being formed-with a passage directly kconnecting arportion oftheprimary air passage which is'beyond the point of separation of the 125 primary and secondaryV air passages ltothe Y iioat` chamber. I

. assafre and another assa e oonnectincf the discharge of said restricted ,passage to the float chamber, a throttle Valve in the inlet passage, a Weighted airv valve slidalol)7 5 mounted in said body and having a central passage conneoting'at one end tothe air passages in said head; and a fuel nozzle eX- tending up from the float chamber into said vcentral passage in the air valve, and means for regulating the flow of fuel therefrom,` .the electiv'e area of said passage loeing reduced at its discharge end to a lesser area than lthat of the disohargeof said restricted passage in said head, so as to reduce the pres sure at Vsuch discharge end of the Jfuel nozzle.

' WILLIAM J. EN EARL. 

